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                    多返回值
            
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                    函数值
            
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                    方法
            
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                    基于指针对象的方法
            
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                    方法值和方法表达式
            
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                    示例: Bit数组
            
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                    封装
            
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                    接口
            
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                    接口是合约
            
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                    接口类型
            
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                    实现接口的条件
            
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                    flag.Value接口
            
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                    接口值
            
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                    sort.Interface接口
            
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                    http.Handler接口
            
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                    error接口
            
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                    示例: 表达式求值
            
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                    类型断言
            
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                    基于类型断言识别错误类型
            
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                    通过类型断言查询接口
            
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                    类型分支
            
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                    示例: 基于标记的XML解码
            
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                    补充几点
            
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                    Goroutines和Channels
            
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                    Goroutines
            
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                    示例: 并发的Clock服务
            
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                    示例: 并发的Echo服务
            
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                    Channels
            
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                    并发的循环
            
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        <li class="chapter " data-level="1.9.6" data-path="../ch8/ch8-06.html">
            
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                    示例: 并发的Web爬虫
            
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                    基于select的多路复用
            
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                    示例: 并发的目录遍历
            
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                    并发的退出
            
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                    示例: 聊天服务
            
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        <li class="chapter " data-level="1.10" data-path="../ch9/ch9.html">
            
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                    基于共享变量的并发
            
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        <li class="chapter " data-level="1.10.1" data-path="../ch9/ch9-01.html">
            
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                    竞争条件
            
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        <li class="chapter " data-level="1.10.2" data-path="../ch9/ch9-02.html">
            
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                    sync.Mutex互斥锁
            
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        <li class="chapter " data-level="1.10.3" data-path="../ch9/ch9-03.html">
            
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                    sync.RWMutex读写锁
            
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                    内存同步
            
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                    sync.Once惰性初始化
            
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        <li class="chapter " data-level="1.10.6" data-path="../ch9/ch9-06.html">
            
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                    竞争条件检测
            
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        </li>
    
        <li class="chapter " data-level="1.10.7" data-path="../ch9/ch9-07.html">
            
                <a href="../ch9/ch9-07.html">
            
                    
                    示例: 并发的非阻塞缓存
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.10.8" data-path="../ch9/ch9-08.html">
            
                <a href="../ch9/ch9-08.html">
            
                    
                    Goroutines和线程
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.11" data-path="../ch10/ch10.html">
            
                <a href="../ch10/ch10.html">
            
                    
                    包和工具
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="1.11.1" data-path="../ch10/ch10-01.html">
            
                <a href="../ch10/ch10-01.html">
            
                    
                    包简介
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.11.2" data-path="../ch10/ch10-02.html">
            
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                    导入路径
            
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                    包声明
            
                </a>
            

            
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        <li class="chapter " data-level="1.11.4" data-path="../ch10/ch10-04.html">
            
                <a href="../ch10/ch10-04.html">
            
                    
                    导入声明
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.11.5" data-path="../ch10/ch10-05.html">
            
                <a href="../ch10/ch10-05.html">
            
                    
                    包的匿名导入
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.11.6" data-path="../ch10/ch10-06.html">
            
                <a href="../ch10/ch10-06.html">
            
                    
                    包和命名
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.11.7" data-path="../ch10/ch10-07.html">
            
                <a href="../ch10/ch10-07.html">
            
                    
                    工具
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.12" data-path="../ch11/ch11.html">
            
                <a href="../ch11/ch11.html">
            
                    
                    测试
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="1.12.1" data-path="../ch11/ch11-01.html">
            
                <a href="../ch11/ch11-01.html">
            
                    
                    go test
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.12.2" data-path="../ch11/ch11-02.html">
            
                <a href="../ch11/ch11-02.html">
            
                    
                    测试函数
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.12.3" data-path="../ch11/ch11-03.html">
            
                <a href="../ch11/ch11-03.html">
            
                    
                    测试覆盖率
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.12.4" data-path="../ch11/ch11-04.html">
            
                <a href="../ch11/ch11-04.html">
            
                    
                    基准测试
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.12.5" data-path="../ch11/ch11-05.html">
            
                <a href="../ch11/ch11-05.html">
            
                    
                    剖析
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.12.6" data-path="../ch11/ch11-06.html">
            
                <a href="../ch11/ch11-06.html">
            
                    
                    示例函数
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.13" data-path="../ch12/ch12.html">
            
                <a href="../ch12/ch12.html">
            
                    
                    反射
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="1.13.1" data-path="../ch12/ch12-01.html">
            
                <a href="../ch12/ch12-01.html">
            
                    
                    为何需要反射?
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.13.2" data-path="../ch12/ch12-02.html">
            
                <a href="../ch12/ch12-02.html">
            
                    
                    reflect.Type和reflect.Value
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.13.3" data-path="../ch12/ch12-03.html">
            
                <a href="../ch12/ch12-03.html">
            
                    
                    Display递归打印
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.13.4" data-path="../ch12/ch12-04.html">
            
                <a href="../ch12/ch12-04.html">
            
                    
                    示例: 编码S表达式
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.13.5" data-path="../ch12/ch12-05.html">
            
                <a href="../ch12/ch12-05.html">
            
                    
                    通过reflect.Value修改值
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.13.6" data-path="../ch12/ch12-06.html">
            
                <a href="../ch12/ch12-06.html">
            
                    
                    示例: 解码S表达式
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.13.7" data-path="../ch12/ch12-07.html">
            
                <a href="../ch12/ch12-07.html">
            
                    
                    获取结构体字段标签
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.13.8" data-path="../ch12/ch12-08.html">
            
                <a href="../ch12/ch12-08.html">
            
                    
                    显示一个类型的方法集
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.13.9" data-path="../ch12/ch12-09.html">
            
                <a href="../ch12/ch12-09.html">
            
                    
                    几点忠告
            
                </a>
            

            
        </li>
    

            </ul>
            
        </li>
    
        <li class="chapter " data-level="1.14" data-path="../ch13/ch13.html">
            
                <a href="../ch13/ch13.html">
            
                    
                    底层编程
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="1.14.1" data-path="../ch13/ch13-01.html">
            
                <a href="../ch13/ch13-01.html">
            
                    
                    unsafe.Sizeof, Alignof 和 Offsetof
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.14.2" data-path="../ch13/ch13-02.html">
            
                <a href="../ch13/ch13-02.html">
            
                    
                    unsafe.Pointer
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.14.3" data-path="../ch13/ch13-03.html">
            
                <a href="../ch13/ch13-03.html">
            
                    
                    示例: 深度相等判断
            
                </a>
            

            
        </li>
    
        <li class="chapter " data-level="1.14.4" data-path="../ch13/ch13-04.html">
            
                <a href="../ch13/ch13-04.html">
            
                    
                    通过cgo调用C代码
            
                </a>
            

            
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        <li class="chapter " data-level="1.14.5" data-path="../ch13/ch13-05.html">
            
                <a href="../ch13/ch13-05.html">
            
                    
                    几点忠告
            
                </a>
            

            
        </li>
    

            </ul>
            
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                    附录
            
                </a>
            

            
            <ul class="articles">
                
    
        <li class="chapter " data-level="1.15.1" data-path="../appendix/appendix-a-errata.html">
            
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                    附录A：原文勘误
            
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                    附录B：作者译者
            
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                    附录C：译文授权
            
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                    附录D：其它语言
            
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                                <h2 id="53-&#x591A;&#x8FD4;&#x56DE;&#x503C;">5.3. &#x591A;&#x8FD4;&#x56DE;&#x503C;</h2>
<p>&#x5728;Go&#x4E2D;&#xFF0C;&#x4E00;&#x4E2A;&#x51FD;&#x6570;&#x53EF;&#x4EE5;&#x8FD4;&#x56DE;&#x591A;&#x4E2A;&#x503C;&#x3002;&#x6211;&#x4EEC;&#x5DF2;&#x7ECF;&#x5728;&#x4E4B;&#x524D;&#x4F8B;&#x5B50;&#x4E2D;&#x770B;&#x5230;&#xFF0C;&#x8BB8;&#x591A;&#x6807;&#x51C6;&#x5E93;&#x4E2D;&#x7684;&#x51FD;&#x6570;&#x8FD4;&#x56DE;2&#x4E2A;&#x503C;&#xFF0C;&#x4E00;&#x4E2A;&#x662F;&#x671F;&#x671B;&#x5F97;&#x5230;&#x7684;&#x8FD4;&#x56DE;&#x503C;&#xFF0C;&#x53E6;&#x4E00;&#x4E2A;&#x662F;&#x51FD;&#x6570;&#x51FA;&#x9519;&#x65F6;&#x7684;&#x9519;&#x8BEF;&#x4FE1;&#x606F;&#x3002;&#x4E0B;&#x9762;&#x7684;&#x4F8B;&#x5B50;&#x4F1A;&#x5C55;&#x793A;&#x5982;&#x4F55;&#x7F16;&#x5199;&#x591A;&#x8FD4;&#x56DE;&#x503C;&#x7684;&#x51FD;&#x6570;&#x3002;</p>
<p>&#x4E0B;&#x9762;&#x7684;&#x7A0B;&#x5E8F;&#x662F;findlinks&#x7684;&#x6539;&#x8FDB;&#x7248;&#x672C;&#x3002;&#x4FEE;&#x6539;&#x540E;&#x7684;findlinks&#x53EF;&#x4EE5;&#x81EA;&#x5DF1;&#x53D1;&#x8D77;HTTP&#x8BF7;&#x6C42;&#xFF0C;&#x8FD9;&#x6837;&#x6211;&#x4EEC;&#x5C31;&#x4E0D;&#x5FC5;&#x518D;&#x8FD0;&#x884C;fetch&#x3002;&#x56E0;&#x4E3A;HTTP&#x8BF7;&#x6C42;&#x548C;&#x89E3;&#x6790;&#x64CD;&#x4F5C;&#x53EF;&#x80FD;&#x4F1A;&#x5931;&#x8D25;&#xFF0C;&#x56E0;&#x6B64;findlinks&#x58F0;&#x660E;&#x4E86;2&#x4E2A;&#x8FD4;&#x56DE;&#x503C;&#xFF1A;&#x94FE;&#x63A5;&#x5217;&#x8868;&#x548C;&#x9519;&#x8BEF;&#x4FE1;&#x606F;&#x3002;&#x4E00;&#x822C;&#x800C;&#x8A00;&#xFF0C;HTML&#x7684;&#x89E3;&#x6790;&#x5668;&#x53EF;&#x4EE5;&#x5904;&#x7406;HTML&#x9875;&#x9762;&#x7684;&#x9519;&#x8BEF;&#x7ED3;&#x70B9;&#xFF0C;&#x6784;&#x9020;&#x51FA;HTML&#x9875;&#x9762;&#x7ED3;&#x6784;&#xFF0C;&#x6240;&#x4EE5;&#x89E3;&#x6790;HTML&#x5F88;&#x5C11;&#x5931;&#x8D25;&#x3002;&#x8FD9;&#x610F;&#x5473;&#x7740;&#x5982;&#x679C;findlinks&#x51FD;&#x6570;&#x5931;&#x8D25;&#x4E86;&#xFF0C;&#x5F88;&#x53EF;&#x80FD;&#x662F;&#x7531;&#x4E8E;I/O&#x7684;&#x9519;&#x8BEF;&#x5BFC;&#x81F4;&#x7684;&#x3002;</p>
<p><u><i>gopl.io/ch5/findlinks2</i></u></p>
<pre><code class="lang-Go"><span class="hljs-keyword">func</span> main() {
    <span class="hljs-keyword">for</span> _, url := <span class="hljs-keyword">range</span> os.Args[<span class="hljs-number">1</span>:] {
        links, err := findLinks(url)
        <span class="hljs-keyword">if</span> err != <span class="hljs-literal">nil</span> {
            fmt.Fprintf(os.Stderr, <span class="hljs-string">&quot;findlinks2: %v\n&quot;</span>, err)
            <span class="hljs-keyword">continue</span>
        }
        <span class="hljs-keyword">for</span> _, link := <span class="hljs-keyword">range</span> links {
            fmt.Println(link)
        }
    }
}

<span class="hljs-comment">// findLinks performs an HTTP GET request for url, parses the</span>
<span class="hljs-comment">// response as HTML, and extracts and returns the links.</span>
<span class="hljs-keyword">func</span> findLinks(url <span class="hljs-keyword">string</span>) ([]<span class="hljs-keyword">string</span>, error) {
    resp, err := http.Get(url)
    <span class="hljs-keyword">if</span> err != <span class="hljs-literal">nil</span> {
        <span class="hljs-keyword">return</span> <span class="hljs-literal">nil</span>, err
    }
    <span class="hljs-keyword">if</span> resp.StatusCode != http.StatusOK {
        resp.Body.Close()
        <span class="hljs-keyword">return</span> <span class="hljs-literal">nil</span>, fmt.Errorf(<span class="hljs-string">&quot;getting %s: %s&quot;</span>, url, resp.Status)
    }
    doc, err := html.Parse(resp.Body)
    resp.Body.Close()
    <span class="hljs-keyword">if</span> err != <span class="hljs-literal">nil</span> {
        <span class="hljs-keyword">return</span> <span class="hljs-literal">nil</span>, fmt.Errorf(<span class="hljs-string">&quot;parsing %s as HTML: %v&quot;</span>, url, err)
    }
    <span class="hljs-keyword">return</span> visit(<span class="hljs-literal">nil</span>, doc), <span class="hljs-literal">nil</span>
}
</code></pre>
<p>&#x5728;findlinks&#x4E2D;&#xFF0C;&#x6709;4&#x5904;return&#x8BED;&#x53E5;&#xFF0C;&#x6BCF;&#x4E00;&#x5904;return&#x90FD;&#x8FD4;&#x56DE;&#x4E86;&#x4E00;&#x7EC4;&#x503C;&#x3002;&#x524D;&#x4E09;&#x5904;return&#xFF0C;&#x5C06;http&#x548C;html&#x5305;&#x4E2D;&#x7684;&#x9519;&#x8BEF;&#x4FE1;&#x606F;&#x4F20;&#x9012;&#x7ED9;findlinks&#x7684;&#x8C03;&#x7528;&#x8005;&#x3002;&#x7B2C;&#x4E00;&#x5904;return&#x76F4;&#x63A5;&#x8FD4;&#x56DE;&#x9519;&#x8BEF;&#x4FE1;&#x606F;&#xFF0C;&#x5176;&#x4ED6;&#x4E24;&#x5904;&#x901A;&#x8FC7;fmt.Errorf&#xFF08;&#xA7;7.8&#xFF09;&#x8F93;&#x51FA;&#x8BE6;&#x7EC6;&#x7684;&#x9519;&#x8BEF;&#x4FE1;&#x606F;&#x3002;&#x5982;&#x679C;findlinks&#x6210;&#x529F;&#x7ED3;&#x675F;&#xFF0C;&#x6700;&#x540E;&#x7684;return&#x8BED;&#x53E5;&#x5C06;&#x4E00;&#x7EC4;&#x89E3;&#x6790;&#x83B7;&#x5F97;&#x7684;&#x8FDE;&#x63A5;&#x8FD4;&#x56DE;&#x7ED9;&#x7528;&#x6237;&#x3002;</p>
<p>&#x5728;findlinks&#x4E2D;&#xFF0C;&#x6211;&#x4EEC;&#x5FC5;&#x987B;&#x786E;&#x4FDD;resp.Body&#x88AB;&#x5173;&#x95ED;&#xFF0C;&#x91CA;&#x653E;&#x7F51;&#x7EDC;&#x8D44;&#x6E90;&#x3002;&#x867D;&#x7136;Go&#x7684;&#x5783;&#x573E;&#x56DE;&#x6536;&#x673A;&#x5236;&#x4F1A;&#x56DE;&#x6536;&#x4E0D;&#x88AB;&#x4F7F;&#x7528;&#x7684;&#x5185;&#x5B58;&#xFF0C;&#x4F46;&#x662F;&#x8FD9;&#x4E0D;&#x5305;&#x62EC;&#x64CD;&#x4F5C;&#x7CFB;&#x7EDF;&#x5C42;&#x9762;&#x7684;&#x8D44;&#x6E90;&#xFF0C;&#x6BD4;&#x5982;&#x6253;&#x5F00;&#x7684;&#x6587;&#x4EF6;&#x3001;&#x7F51;&#x7EDC;&#x8FDE;&#x63A5;&#x3002;&#x56E0;&#x6B64;&#x6211;&#x4EEC;&#x5FC5;&#x987B;&#x663E;&#x5F0F;&#x7684;&#x91CA;&#x653E;&#x8FD9;&#x4E9B;&#x8D44;&#x6E90;&#x3002;</p>
<p>&#x8C03;&#x7528;&#x591A;&#x8FD4;&#x56DE;&#x503C;&#x51FD;&#x6570;&#x65F6;&#xFF0C;&#x8FD4;&#x56DE;&#x7ED9;&#x8C03;&#x7528;&#x8005;&#x7684;&#x662F;&#x4E00;&#x7EC4;&#x503C;&#xFF0C;&#x8C03;&#x7528;&#x8005;&#x5FC5;&#x987B;&#x663E;&#x5F0F;&#x7684;&#x5C06;&#x8FD9;&#x4E9B;&#x503C;&#x5206;&#x914D;&#x7ED9;&#x53D8;&#x91CF;:</p>
<pre><code class="lang-Go">links, err := findLinks(url)
</code></pre>
<p>&#x5982;&#x679C;&#x67D0;&#x4E2A;&#x503C;&#x4E0D;&#x88AB;&#x4F7F;&#x7528;&#xFF0C;&#x53EF;&#x4EE5;&#x5C06;&#x5176;&#x5206;&#x914D;&#x7ED9;blank identifier:</p>
<pre><code class="lang-Go">links, _ := findLinks(url) <span class="hljs-comment">// errors ignored</span>
</code></pre>
<p>&#x4E00;&#x4E2A;&#x51FD;&#x6570;&#x5185;&#x90E8;&#x53EF;&#x4EE5;&#x5C06;&#x53E6;&#x4E00;&#x4E2A;&#x6709;&#x591A;&#x8FD4;&#x56DE;&#x503C;&#x7684;&#x51FD;&#x6570;&#x8C03;&#x7528;&#x4F5C;&#x4E3A;&#x8FD4;&#x56DE;&#x503C;&#xFF0C;&#x4E0B;&#x9762;&#x7684;&#x4F8B;&#x5B50;&#x5C55;&#x793A;&#x4E86;&#x4E0E;findLinks&#x6709;&#x76F8;&#x540C;&#x529F;&#x80FD;&#x7684;&#x51FD;&#x6570;&#xFF0C;&#x4E24;&#x8005;&#x7684;&#x533A;&#x522B;&#x5728;&#x4E8E;&#x4E0B;&#x9762;&#x7684;&#x4F8B;&#x5B50;&#x5148;&#x8F93;&#x51FA;&#x53C2;&#x6570;&#xFF1A;</p>
<pre><code class="lang-Go"><span class="hljs-keyword">func</span> findLinksLog(url <span class="hljs-keyword">string</span>) ([]<span class="hljs-keyword">string</span>, error) {
    log.Printf(<span class="hljs-string">&quot;findLinks %s&quot;</span>, url)
    <span class="hljs-keyword">return</span> findLinks(url)
}
</code></pre>
<p>&#x5F53;&#x4F60;&#x8C03;&#x7528;&#x63A5;&#x53D7;&#x591A;&#x53C2;&#x6570;&#x7684;&#x51FD;&#x6570;&#x65F6;&#xFF0C;&#x53EF;&#x4EE5;&#x5C06;&#x4E00;&#x4E2A;&#x8FD4;&#x56DE;&#x591A;&#x53C2;&#x6570;&#x7684;&#x51FD;&#x6570;&#x8C03;&#x7528;&#x4F5C;&#x4E3A;&#x8BE5;&#x51FD;&#x6570;&#x7684;&#x53C2;&#x6570;&#x3002;&#x867D;&#x7136;&#x8FD9;&#x5F88;&#x5C11;&#x51FA;&#x73B0;&#x5728;&#x5B9E;&#x9645;&#x751F;&#x4EA7;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;&#x4F46;&#x8FD9;&#x4E2A;&#x7279;&#x6027;&#x5728;debug&#x65F6;&#x5F88;&#x65B9;&#x4FBF;&#xFF0C;&#x6211;&#x4EEC;&#x53EA;&#x9700;&#x8981;&#x4E00;&#x6761;&#x8BED;&#x53E5;&#x5C31;&#x53EF;&#x4EE5;&#x8F93;&#x51FA;&#x6240;&#x6709;&#x7684;&#x8FD4;&#x56DE;&#x503C;&#x3002;&#x4E0B;&#x9762;&#x7684;&#x4EE3;&#x7801;&#x662F;&#x7B49;&#x4EF7;&#x7684;&#xFF1A;</p>
<pre><code class="lang-Go">log.Println(findLinks(url))
links, err := findLinks(url)
log.Println(links, err)
</code></pre>
<p>&#x51C6;&#x786E;&#x7684;&#x53D8;&#x91CF;&#x540D;&#x53EF;&#x4EE5;&#x4F20;&#x8FBE;&#x51FD;&#x6570;&#x8FD4;&#x56DE;&#x503C;&#x7684;&#x542B;&#x4E49;&#x3002;&#x5C24;&#x5176;&#x5728;&#x8FD4;&#x56DE;&#x503C;&#x7684;&#x7C7B;&#x578B;&#x90FD;&#x76F8;&#x540C;&#x65F6;&#xFF0C;&#x5C31;&#x50CF;&#x4E0B;&#x9762;&#x8FD9;&#x6837;&#xFF1A;</p>
<pre><code class="lang-Go"><span class="hljs-keyword">func</span> Size(rect image.Rectangle) (width, height <span class="hljs-keyword">int</span>)
<span class="hljs-keyword">func</span> Split(path <span class="hljs-keyword">string</span>) (dir, file <span class="hljs-keyword">string</span>)
<span class="hljs-keyword">func</span> HourMinSec(t time.Time) (hour, minute, second <span class="hljs-keyword">int</span>)
</code></pre>
<p>&#x867D;&#x7136;&#x826F;&#x597D;&#x7684;&#x547D;&#x540D;&#x5F88;&#x91CD;&#x8981;&#xFF0C;&#x4F46;&#x4F60;&#x4E5F;&#x4E0D;&#x5FC5;&#x4E3A;&#x6BCF;&#x4E00;&#x4E2A;&#x8FD4;&#x56DE;&#x503C;&#x90FD;&#x53D6;&#x4E00;&#x4E2A;&#x9002;&#x5F53;&#x7684;&#x540D;&#x5B57;&#x3002;&#x6BD4;&#x5982;&#xFF0C;&#x6309;&#x7167;&#x60EF;&#x4F8B;&#xFF0C;&#x51FD;&#x6570;&#x7684;&#x6700;&#x540E;&#x4E00;&#x4E2A;bool&#x7C7B;&#x578B;&#x7684;&#x8FD4;&#x56DE;&#x503C;&#x8868;&#x793A;&#x51FD;&#x6570;&#x662F;&#x5426;&#x8FD0;&#x884C;&#x6210;&#x529F;&#xFF0C;error&#x7C7B;&#x578B;&#x7684;&#x8FD4;&#x56DE;&#x503C;&#x4EE3;&#x8868;&#x51FD;&#x6570;&#x7684;&#x9519;&#x8BEF;&#x4FE1;&#x606F;&#xFF0C;&#x5BF9;&#x4E8E;&#x8FD9;&#x4E9B;&#x7C7B;&#x4F3C;&#x7684;&#x60EF;&#x4F8B;&#xFF0C;&#x6211;&#x4EEC;&#x4E0D;&#x5FC5;&#x601D;&#x8003;&#x5408;&#x9002;&#x7684;&#x547D;&#x540D;&#xFF0C;&#x5B83;&#x4EEC;&#x90FD;&#x65E0;&#x9700;&#x89E3;&#x91CA;&#x3002;</p>
<p>&#x5982;&#x679C;&#x4E00;&#x4E2A;&#x51FD;&#x6570;&#x6240;&#x6709;&#x7684;&#x8FD4;&#x56DE;&#x503C;&#x90FD;&#x6709;&#x663E;&#x5F0F;&#x7684;&#x53D8;&#x91CF;&#x540D;&#xFF0C;&#x90A3;&#x4E48;&#x8BE5;&#x51FD;&#x6570;&#x7684;return&#x8BED;&#x53E5;&#x53EF;&#x4EE5;&#x7701;&#x7565;&#x64CD;&#x4F5C;&#x6570;&#x3002;&#x8FD9;&#x79F0;&#x4E4B;&#x4E3A;bare return&#x3002;</p>
<pre><code class="lang-Go"><span class="hljs-comment">// CountWordsAndImages does an HTTP GET request for the HTML</span>
<span class="hljs-comment">// document url and returns the number of words and images in it.</span>
<span class="hljs-keyword">func</span> CountWordsAndImages(url <span class="hljs-keyword">string</span>) (words, images <span class="hljs-keyword">int</span>, err error) {
    resp, err := http.Get(url)
    <span class="hljs-keyword">if</span> err != <span class="hljs-literal">nil</span> {
        <span class="hljs-keyword">return</span>
    }
    doc, err := html.Parse(resp.Body)
    resp.Body.Close()
    <span class="hljs-keyword">if</span> err != <span class="hljs-literal">nil</span> {
        err = fmt.Errorf(<span class="hljs-string">&quot;parsing HTML: %s&quot;</span>, err)
        <span class="hljs-keyword">return</span>
    }
    words, images = countWordsAndImages(doc)
    <span class="hljs-keyword">return</span>
}
<span class="hljs-keyword">func</span> countWordsAndImages(n *html.Node) (words, images <span class="hljs-keyword">int</span>) { <span class="hljs-comment">/* ... */</span> }
</code></pre>
<p>&#x6309;&#x7167;&#x8FD4;&#x56DE;&#x503C;&#x5217;&#x8868;&#x7684;&#x6B21;&#x5E8F;&#xFF0C;&#x8FD4;&#x56DE;&#x6240;&#x6709;&#x7684;&#x8FD4;&#x56DE;&#x503C;&#xFF0C;&#x5728;&#x4E0A;&#x9762;&#x7684;&#x4F8B;&#x5B50;&#x4E2D;&#xFF0C;&#x6BCF;&#x4E00;&#x4E2A;return&#x8BED;&#x53E5;&#x7B49;&#x4EF7;&#x4E8E;&#xFF1A;</p>
<pre><code class="lang-Go"><span class="hljs-keyword">return</span> words, images, err
</code></pre>
<p>&#x5F53;&#x4E00;&#x4E2A;&#x51FD;&#x6570;&#x6709;&#x591A;&#x5904;return&#x8BED;&#x53E5;&#x4EE5;&#x53CA;&#x8BB8;&#x591A;&#x8FD4;&#x56DE;&#x503C;&#x65F6;&#xFF0C;bare return &#x53EF;&#x4EE5;&#x51CF;&#x5C11;&#x4EE3;&#x7801;&#x7684;&#x91CD;&#x590D;&#xFF0C;&#x4F46;&#x662F;&#x4F7F;&#x5F97;&#x4EE3;&#x7801;&#x96BE;&#x4EE5;&#x88AB;&#x7406;&#x89E3;&#x3002;&#x4E3E;&#x4E2A;&#x4F8B;&#x5B50;&#xFF0C;&#x5982;&#x679C;&#x4F60;&#x6CA1;&#x6709;&#x4ED4;&#x7EC6;&#x7684;&#x5BA1;&#x67E5;&#x4EE3;&#x7801;&#xFF0C;&#x5F88;&#x96BE;&#x53D1;&#x73B0;&#x524D;2&#x5904;return&#x7B49;&#x4EF7;&#x4E8E; return 0,0,err&#xFF08;Go&#x4F1A;&#x5C06;&#x8FD4;&#x56DE;&#x503C; words&#x548C;images&#x5728;&#x51FD;&#x6570;&#x4F53;&#x7684;&#x5F00;&#x59CB;&#x5904;&#xFF0C;&#x6839;&#x636E;&#x5B83;&#x4EEC;&#x7684;&#x7C7B;&#x578B;&#xFF0C;&#x5C06;&#x5176;&#x521D;&#x59CB;&#x5316;&#x4E3A;0&#xFF09;&#xFF0C;&#x6700;&#x540E;&#x4E00;&#x5904;return&#x7B49;&#x4EF7;&#x4E8E; return words, image, nil&#x3002;&#x57FA;&#x4E8E;&#x4EE5;&#x4E0A;&#x539F;&#x56E0;&#xFF0C;&#x4E0D;&#x5B9C;&#x8FC7;&#x5EA6;&#x4F7F;&#x7528;bare return&#x3002;</p>
<p><strong>&#x7EC3;&#x4E60; 5.5&#xFF1A;</strong> &#x5B9E;&#x73B0;countWordsAndImages&#x3002;&#xFF08;&#x53C2;&#x8003;&#x7EC3;&#x4E60;4.9&#x5982;&#x4F55;&#x5206;&#x8BCD;&#xFF09;</p>
<p><strong>&#x7EC3;&#x4E60; 5.6&#xFF1A;</strong> &#x4FEE;&#x6539;gopl.io/ch3/surface&#xFF08;&#xA7;3.2&#xFF09;&#x4E2D;&#x7684;corner&#x51FD;&#x6570;&#xFF0C;&#x5C06;&#x8FD4;&#x56DE;&#x503C;&#x547D;&#x540D;&#xFF0C;&#x5E76;&#x4F7F;&#x7528;bare return&#x3002;</p>

                                
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